I love when we are able to find seemingly simple solutions to everyday problems. Product Tank did just that with "New Rule", a ruler for the visually impaired. Adding to the large, high contrast numbers you would expect, "New Rule" has a slider with a geared wheel that displays the measurement mechanically without the need for the cost and complication of electronics. I love how it goes one step further with a slide out caliper arm.
Check out more about it >>> HERE